Cowling part and combustor assembly for a gas turbine

ABSTRACT

A covering part for a combustion chamber of a gas turbine is configured and provided to guide a fluid flow downstream of a diffuser of the gas turbine at least partially into a flow area outside of a combustion space of the combustion chamber so as to cool a combustion chamber wall that delimits the combustion space and has at least one mounting edge at which at least one attachment site is provided for fixating the covering part at the combustion chamber wall by means of a separate attachment element. At least one guiding element is provided at the covering part in the area of the mounting edge, which during operation of the gas turbine guides the partial flow of the fluid flow to be guided in the direction of the flow area over and above a part of the attachment element that protrudes from the mounting edge.

CROSS REFERENCE TO RELATED APPLICATION

This application claims priority to German Patent Application No. 10 2015 213 629.9 filed on Jul. 20, 2015, the entirety of which is incorporated by reference herein.

BACKGROUND

The invention relates to a covering part for a combustion chamber of a gas turbine as well as a combustion chamber assembly group for a gas turbine with such a covering part, which is provided in the area of a combustion chamber head.

A generic covering part is configured and provided for guiding a fluid flow downstream of a diffuser of the gas turbine at least partially into a flow area outside of a combustion space of the combustion chamber in order to cool a combustion chamber wall that delimits the combustion space. Thus, such a covering part is provided for example in an annular manner in the area of a combustion chamber head in order to divide a primary air flow and, for one thing, guide air via a combustor dome into the combustion space and, for another, past the combustion space in order to cool the combustion chamber walls. In the context of gas turbine engines, such a covering part is also referred to as an inflow or inlet hood, and also as a “cowling”.

Such a covering part if fixated via at least one mounting edge at a combustion chamber wall of the combustion chamber by means of a separate attachment element, for example in the form of a bolt. For this purpose, at least one attachment site for an attachment element is provided at the mounting edge, for example in the form of a bore. Because the covering part is manufactured separately and can subsequently be fixated to a combustion chamber wall, it can be manufactured in a comparably cost-effective manner. Thus, such a covering part is in particular different from solutions as they are known from the state of the art, in which a covering part is formed in one piece with a combustion chamber wall, as is for example shown in DE 100 48 864 A1 and DE 196 43 028 A1.

In covering parts that are fixated at a combustion chamber wall as a separate structural component, it is preferred in practice, with a view to a simplified mounting and to avoiding leakages, that a section of the [mounting edge] to which the attachment element is attached extends substantially in parallel or perpendicular to a turbine axis. Thus, a mounting edge of the covering part that is provided for positioning at least one bolt head or a nut extends preferably in a planar manner along a lateral surface of a circular-cylindrical section of the covering part. Thus, the mounting edge can be formed in a circular-cylindrical manner in order to fixate the covering part at a combustion chamber wall via multiple attachment elements that are arranged at a distance from each other along the circumference. Such covering parts with corresponding mounting edges and screws or threaded bolts provided for fixating are known from EP 0 550 953 A1, EP 1 340 941 B1 and US 5,924,288 A, for example.

However, it has been observed in practice that undesired flow interferences may occur in the area of the screw or bold heads of the attachment elements via which the covering part is fixated at the combustion chamber wall. Thus, return flows, turbulences, and/or flow separation and consequently the possibility of relatively large pressure losses may occur in that area, which have a direct negative effect on the fuel consumption. Besides, this may also have a negative impact on the surround-flow around the combustion chamber wall and thus possibly on the cooling of the combustion chamber wall. In particular when it comes to canted combustion chambers, i.e. combustion chambers having a central axis with a comparably large angle (larger than 10°) with respect to the horizontal and/or vertical line, the previously mentioned negative effects in the area of the mounting edges of the covering part are increasingly observed.

SUMMARY

Thus, it is an objective of the invention to improve a covering part and a combustion chamber assembly group with such a covering part in this respect and to avoid undesired flow interferences in the area of the fixation of the covering part.

This objective is achieved with a covering part as described herein.

What is suggested here according to the invention is a covering part for a combustion chamber of a gas turbine, which is

-   -   configured and provided for guiding a fluid flow downstream of a         diffuser of the gas turbine at least partially in a flow area         outside of a combustion space of the combustion chamber in order         to cool a combustion chamber wall that delimits the combustion         space, and which     -   has at least one mounting edge, at which at least one attachment         site is provided for fixating the covering part at the         combustion chamber wall by means of a separate attachment         element, as for example a screw or a (threaded) bolt, and which     -   has at least one guiding element in the area of the mounting         edge, which during operation of the gas turbine guides the         partial flow of the fluid flow, which is to be guided in the         direction of the flow area, over and above a part of the         attachment element that protrudes over a mounting edge.

Thus, an aerodynamically more advantageous geometry is formed by means of the at least one guiding element, guiding the partial flow of the fluid flow for example around a screw joint and in particular around a bolt head that protrudes at the mounting edge, and in this way in particular reduces the risk of any undesired turbulences occurring in the area where the covering part is connected to the combustion chamber wall.

By using a guiding element, which can guide the partial flow of the fluid flow in a targeted manner over and above that part of an attachment element that protrudes at the mounting edge, or over and above multiple such parts of multiple attachment elements, the contact surface for the attachment element formed by the mounting edge can still extend in a manner perpendicular or in parallel to the turbine axis. Thus, the mounting edge can for example still be formed so as to extend in a circular-cylindrical manner around a turbine axis and so as to protrude in parallel to the turbine axis, so that the screws or bolts that are necessary for fixating the covering part can then be mounted in a perpendicular manner and thus radially with respect to the turbine axis.

In order to be able to effectively guide a partial flow of the fluid flow over and above the part of the attachment element that protrudes at the mounting edge by means of the at least one guiding element, it is provided in an embodiment variant that the at least one guiding element extends at least across a section of the mounting edge. At that, the guiding element preferably extends in particular over and above that section or those sections of the mounting edge in which an attachment site or multiple attachment sites are provided for the attachment elements that are necessary for fixating the covering part.

In order to at least partially cover a part of an attachment element that is protruding at the mounting edge, for example a screw or bolt head, by means of the guiding element and at the same time still achieve a simple mounting and in particular simple attachment of the attachment element in such a variant, the guiding element can have one or multiple recesses. Here, the size of a recess is dimensioned in such a manner that the attachment element can be passed through the same. An attachment means that engages at the disassembly edge can then be accessed through a recess of the guiding element and/or an attachment element that is provided for the purpose of fixating the covering part can be guided towards the mounting edge so as to fixate the covering part. The covering part including the guiding element provided thereat is thus for example arranged at the combustion chamber wall, and subsequently a screw or a threaded bolt is inserted through respectively one recess and then screwed on from the other side with a nut.

The at least one guiding element can principally be fixated as an additional component at the covering part. Alternatively, the at least one guiding element is formed by a section of the covering part and can be formed at the covering part.

In addition, it is provided in a further development that the mounting edge is also formed in one piece with the guiding element. Here, the mounting edge can be bent with respect to a section of the covering part that forms the guiding element, so that the section of the covering part that forms the guiding element is positioned opposite the mounting edge. In such an exemplary embodiment, the covering part is for example formed in an annular manner with a circumferentially bent mounting edge, which abuts the attachment section of the combustion chamber wall in a planar manner in a state where it is mounted according to the intended use.

Then, in an exemplary embodiment, the heads of the attachment elements that are provided for fixating the covering part at the attachment section of the combustion chamber wall and that are inserted through recesses in the guiding element are present in a mounting channel that runs all the way around the circumference after having been mounted according to the intended use. At the radially inner side, this mounting channel is delimited by the mounting edge and at a radially outer side by the guiding element.

In particular in such an embodiment variant, the mounting edge can be bent by at least 160°, preferably by approximately 180°, with respect to an (edge) section of the covering part that forms the guiding element.

In one embodiment variant, at least one additional guiding element can be provided at the covering part, bridging a gap that is present between the guiding element and the adjacent combustion chamber wall in a state of being mounted according to the intended use of the covering part. Thus, an additional flow optimization is achieved through the additional guiding element. Due to the existing gap, turbulences and/or return flows are avoided downstream of the guiding element.

The additional guiding element can be welded to the covering part, for example at a downstream rear area of the guiding element.

In one embodiment variant, the covering part is provided for fixating at an inner as well as an outer combustion chamber wall, which together form the combustion space. Consequently, what is required are not two inner and outer covering parts extending concentrically with respect to each other in the area of the combustion chamber head. But rather, in this embodiment variant, for example an annular covering part is provided that is fixated at the inner and outer combustion chamber wall, and thus guides a part of the cooling flow coming from the diffuser into a radially outer as well as into a radially inner flow area outside of the combustion space so as to cool the combustion chamber. At a front side of the covering part that is facing towards the diffuser, multiple inflow openings are provided, so that air can also be guided into the combustion space.

In one embodiment variant, in which the covering part has to be fixated at the outer as well as at the inner combustion chamber wall, also two additional guiding elements can provided, of which a first additional guiding element bridges a first gap between an outer guiding element and the adjacent outer combustion chamber wall, and a second additional guiding element bridges a gap between an inner guiding element and the adjacent inner combustion chamber wall.

Independently of whether one or two additional guiding elements are used, it is preferable that an additional guiding element is formed in an annular manner and thus extends over the entire (outer or inner) circumference of the covering part.

Generally, it can be provided that the covering part does not only guide a part of the fluid flow coming from the diffuser into the direction of an outer and/or inner flow area outside of the combustion space. Rather, such a covering part can usually also partially guide a fluid flow coming from the diffuser into the direction of a combustor dome via a correspondingly embodied (inner) edge and/or a correspondingly embodied (inner) opening in order to create a flammable fuel-air-mixture inside the combustion space.

What is further suggested is a combustion chamber assembly group for a gas turbine where a covering part according to the invention is used, comprising

-   -   an inner and an outer combustion chamber wall, which together         delimit a combustion space of the combustion chamber and define         two flow areas that are separated from each other by the         combustion space,     -   a combustion chamber head that is arranged downstream of a         diffuser of the gas turbine and via which a part of a fluid flow         can reach the interior of the combustion space, and     -   a covering part according to the invention, which is fixated in         the area of the combustion chamber head via its at least one         mounting edge and has at least one guiding element—preferably         one that runs all the way around the circumference of the         covering part—that is configured in such a manner that, during         operation of the gas turbine, it guides a partial flow of the         fluid flow over and above a part of an attachment element that         protrudes from the mounting edge and by means of which the         covering part is fixated at the combustion chamber wall.

Here, the mounting edge can extend at least in the area of the attachment site for an attachment element in a manner substantially perpendicular or in parallel to a turbine axis so as to facilitate the manufacture of the mounting edge as well as the attachment of the attachment element.

In one embodiment variant, the covering part is connected, via a single attachment element in the area of the mounting edge of the covering part, to a separate combustion chamber head plate at which a fuel nozzle for injecting fuel into the combustion space is supported, as well as to a combustion chamber wall. Thus, ultimately three separate structural components of the combustion chamber assembly group are fixedly connected to each other by means of the single attachment element. For this purpose, the said structural components preferably respectively form a cylindrical edge with multiple recesses, perforations or bores through which a threaded bolt may be passed if they are aligned with each other. A covering part according to the invention and/or a combustion chamber assembly group according to the invention can be used in a gas turbine engine, for example.

BRIEF DESCRIPTION OF THE DRAWINGS

Other advantages and features of the invention will become clear in the following description of exemplary embodiments based on the Figures.

FIG. 1A shows, in cross-sectional view and by sections, a combustion chamber of a gas turbine engine with a covering part that is screwed on at an outer combustion chamber wall as well as at an inner combustion chamber wall in the area of a combustion chamber head.

FIG. 1B shows, by sections, a frontal view of the covering part with a cutting line A-A along which the cross-sectional view of FIG. 1A is obtained.

FIGS. 2A-2B show, respectively by sections and in a cross-sectional view, embodiments of combustion chamber assembly groups with a covering part as known from the state of the art.

FIGS. 3A to 3B show, in different cross-sectional views and respectively by section, a first embodiment variant of a combustion chamber assembly group according to the invention with a covering part embodied according to the invention, forming two guiding elements so as to guide a fluid flow in a targeted manner over and above a bolt head of a bolt that is provided for fixating the covering part in the area of an outer combustion chamber wall and in the area of an inner combustion chamber wall.

FIG. 3C shows, in a frontal view and by sections, the covering part of FIGS. 3A and 3B, illustrating two cutting lines A-A and B-B along which the cross-sectional views of FIGS. 3A and 3B are obtained.

FIG. 4 shows, in a cross-sectional view and by sections, a second exemplary embodiment of a combustion chamber assembly group according to the invention, in which an additional guiding element is provided at the covering part, bridging a gap between one of the guiding elements and the adjacent outer combustion chamber wall.

DETAILED DESCRIPTION

FIGS. 1A and 1B show, in various views and by sections, a combustion chamber of a gas turbine engine that is arranged downstream of a diffuser of the gas turbine engine along an engine axis T. In the combustion chamber, a combustion space 11 is defined that is delimited by an inner and an outer combustion chamber wall, i.e. a combustion chamber outer wall 1 a and a combustion chamber inner wall 1 b. An outer flow area 12 a is provided at a radially outer side with respect to the engine axis T. At a radially inner side, an inner flow area 12 b is provided. Into these flow areas 12 a and 12 b of the combustion chamber, a part of the fluid flow coming from the diffuser is guided during operation of the gas turbine engine in order to cool the combustion chamber walls 1 a and 1 b. Moreover, a part of the fluid flow is guided through the combustion chamber head plate 3 into the combustion space 11 in order to supply an inflammable fuel-air mixture there. Here, the combustion chamber head plate 3 connects the combustion chamber walls 1 a and 1 b at a front side that is facing towards the diffuser. At the combustion chamber head plate 3, a heat shield 2, among other things, is fixated via multiple bolts 7 a and nuts 7 b. What can further be provided at the combustion chamber head plate 3 is a combustor dome, which is not shown here and at which fuel is injected into the combustion space 11.

In order to, on the one hand, guide the fluid flow coming from the diffuser into the combustion space 11, and, on the other hand, past the combustion space into the inner and outer flow areas 12 a and 12 b, a covering part 4 is provided in the area of the combustion chamber head plate 3. This covering part 4 is bulged in a convex manner in the direction of the diffuser and forms a combustion chamber head that is arranged in front of the combustion chamber head plate 3.

The covering part 4 is fixated via multiple screwed connections at the two combustion chamber walls 1 a and 1 b. Attachment elements in the form of (threaded) bolts 5 and nuts 6 are respectively provided for screwing the covering part 4 to the combustion chamber outer wall 1 a as well as to the combustion chamber inner wall 1 b. At that, the individual bolts 5 are arranged at a distance from each other respectively along a radially outer and a radially inner circumference of the annular covering part 4, so that the covering part 4 is fixated at the combustion chamber walls 1 a and 1 b. Here, each bolt 5 is inserted, on the one hand, through a bore in a mounting edge 40 a or 40 b, and, on the other hand, through a bore or opening in an axially projecting attachment section 10 a or 10 b of the respective combustion chamber wall 1 a or 1 b, as well as through a bore or opening in an attachment edge 30 a or 30 b of the combustion chamber head plate 3. A nut 6 is then screwed onto the threaded section of a bolt 5 that is respectively pinned trough the three mentioned components in order to connect the covering part 4 to the combustion chamber walls 1 a, 1 b and the combustion chamber head plate 3 in a fixated manner.

As can be seen from the frontal view of FIG. 1B, multiple inflow openings 41 are provided at the covering part 4 that are arranged at a distance from each other—preferably equidistantly—along the circumference and through which air can be guided in the direction of the combustion chamber head plate 3 and into the interior of the combustion space 11. Here, each inflow opening 41 defines a burner sector. In the present case, two bolts 5 for fixating the covering part 4 at the combustion chamber outer wall 1 a and two bolts 5 for fixating the covering part 4 at the combustion chamber inner wall 1 b are provided per sector.

Via the convex bulge of the covering part 4 between its two mounting edges 40 a and 40 b, a fluid flow that is impinging thereon is guided in a partially targeted manner into the two flow areas 12 a and 12 b to cool the combustion chamber walls 1 a and 1 b. The mounting edges 40 a and 40 b are also formed in a cylindrical manner with respect to the engine axis T and thus define locating surfaces for being placed at the corresponding attachment section 10 a or 10 b of a combustion chamber wall 1 a or 1 b that extends in parallel to the engine axis T. The result is a comparably strong offset between the convexly bulged front side of the covering part 4 and the respective mounting edge 40 a or 40 b, as well as the bolt head of a bolt 5 that is protruding therefrom. Due to this fact, especially in the area of the respective bolt 5 and thus in the transitional area between the covering part 4 and a combustion chamber wall 1 a or 1 b, undesired turbulences, return flows or flow separation may occur, which in turn may lead to high pressure losses and thus to increased fuel requirements.

As is illustrated in FIGS. 2A and 2B, this problem is intensified especially in so-called canted combustion chambers that have a central axis M which during operation extends at a comparably large angle with respect to the engine axis T and thus to the horizontal line. Here, FIG. 2A illustrates the occurrence of turbulences and return flows in the area of the transition between the covering part 4 and the combustion chamber outer wall 1 a, as well as the covering part 4 and the combustion chamber inner wall 1 b in an exemplary manner based on two fluid flows fa and fb in the direction of the two flow areas 12 a and 12 b in a combustion chamber that is canted only to a small degree. In FIG. 2B, a combustion chamber is illustrated which is canted considerably more and in which the radial outer mounting edge 40 a of the covering part 4 extends perpendicularly to the engine axis T in order to facilitate a defined placement area for the bolt head and to render screwing easier. Here, turbulences and return flows of an undesired strength may possibly occur in the area of the screwing in a fluid flow fa that is guided in the direction of the radial outer flow area 12 a.

In a first embodiment variant according to the invention as it is illustrated in the FIGS. 3A, 3B and 3C, this problem is remedied. Here, an aerodynamically improved shape is formed in the area of the fixation of the covering part 4 in order to guide a flow around a screw joint and over and above a part of an attachment element that protrudes over a mounting edge 421 a, 421 b of the covering part 4, such as for example a bolt head, in an aerodynamically advantageous manner. For this purpose, in the covering part 4 of FIGS. 3A to 3C that is preferably embodied as a drawn sheet metal part, the inner and outer mounting edges 421 a and 421 b, which are provided for placement at the attachment section and 10 a and 10 b of the combustion chamber walls 1 a and 1 b, are bent inward by approximately 180°. Thus, an edge section of the covering part 4 covers the respective mounting edge 421 a, 421 b and respectively extends across the same, namely at a distance which at least corresponds to the height of a bolt head of a bolt 5. In this way, a circumferential mounting channel is formed between an edge section of the covering part 4 and the respective bent mounting edge 421 a or 421 b, inside of which the respective bold heads of the bolt 5 are completely received. In this way, at its radially outer edge as well as at its radially inner edge, the covering part 4 forms guiding elements 42 a and 42 b for paneling the screw joints, wherein the guiding elements 42 a, 42 b extend at least beyond a section of the corresponding mounting edge 421 a or 421 b and thus guide a flow over and above a bolt head.

Here, a section formed by a guiding element 42 a or 42 b, having an outer or an inner guide surface 420 a or 420 b for guiding the fluid flow, is positioned directly opposite the planar mounting edge 421 a or 421 b. Here, it is respectively ensured by a guiding element 42 a, 42 b with its guide surface 420 a or 420 b that the flow flows in a targeted manner over and beyond the bolt head that projects in an elevated manner from the respective mounting edge 421 a or 421 b, without the bolt head being positioned directly in the flow direction. Thus, by providing a guiding element 42 a or 42 b at the covering part 4, any interference of the fluid flow is avoided in the flow areas 12 a and 12 b in the area of the screw joints of the covering part 4.

At that, the covering part 4 that is formed according to the invention and that is preferably manufactured in a cost-effective manner from sheet metal is also easy to mount. Thus, the mounting edges 421 a and 421 b that extend concentrically with respect to each other are respectively formed in a circular-cylindrical manner at the covering part 4 and thus form a locating surface for fixating the covering part 4 at the combustion chamber outer wall 1 a and the combustion chamber inner wall 1 b that extends substantially in parallel to the engine axis T. Thus, the individual bolts 5 can be inserted and screwed on substantially perpendicularly to the engine axis T. In order to be able to unproblematically attach the individual bolts 5 after the covering part 4 has been arranged at the combustion chamber walls 1 a and 1 b, each of the guiding elements 42 a, 42 b has multiple recesses 43 a and 43 b for the bolt 5 along their circumference at their respective guide surfaces 420 a or 420 b. A bolt 5 can be inserted through each of these preferably circular recesses 43 a and 43 b, and its bolt head becomes accessible for a tool so as to fixate the covering part 4. In the cross-sectional view of FIG. 3B, two recesses 43 a and 43 b of the covering part 4 at the radial outer guide surface 420 a and the radial inner guide surface 420 b are shown in an exemplary manner.

FIG. 4 shows, in a cross-sectional view that corresponds to FIG. 3A, a second embodiment variant of a solution according to the invention, in which an annular guide plate 8 is additionally welded to the covering part 4 that is flow-optimized through the guiding elements 42 a and 42 b. This guide plate 8 represents an additional guiding element that bridges a gap S between the radial outer guiding element 42 a and the adjacent combustion chamber outer wall 1 a. Through the guide plate 8, a smooth transition is achieved between the bent edge of the covering part 4 and the adjacent combustion chamber outer wall 1 a, so that the risk of any turbulences or return flows is thus additionally minimized in the area of the gap S.

In the present case, the guide plate 8 is welded to the covering part 4 in the area of the downstream, rear area of the outer guiding element 42 a through a welding seam 80. However, alternatively the guide plate 8 can also be screwed on, for example.

Further, it can be provided in an alternative embodiment variant that the guide plate 8 is not formed so as to run all the way around the outer circumference, and thus not in a circular-cylindrical manner. Instead, it would also be conceivable to provide a guide plate 8 only locally, for example adjacent to and downstream of a recess 43 a. In this case, such a guide plate 8 consequently extends only across a fraction of the circumference of the covering part 4, so that multiple individual guide plates 8 can be provided at the covering part 4.

Principally, the guide plate 8 can also be embodied in a conical manner. Alternatively or additionally, a (further) guide plate 8 can also be provided in the area of the transition between the radial inner guiding element 42 b and the combustion chamber inner wall 1 b.

Parts List

-   1 a combustion chamber outer wall -   1 b combustion chamber inner wall -   10 a, 10 b attachment section -   11 combustion space -   12 a, 12 b outer/inner flow area -   2 heat shield -   3 combustion chamber head plate -   30 a, 30 b attachment edge -   4 covering part/combustion chamber head -   40 a, 40 b outer/inner mounting edge -   41 inflow opening -   420 a, 420 b outer/inner guide surface -   421 a, 421 b mounting edge -   42 a, 42 b guiding element -   43 a, 43 b recess -   5 bolt (attachment element) -   6 nut -   7 a bolt -   7 b nut -   8 guide plate (additional guiding element) -   80 welding seam -   f_(a), f_(b) fluid flow -   M central axis -   S gap -   T engine axis 

1. A covering part for a combustion chamber of a gas turbine, wherein the covering part is configured and provided to guide a fluid flow downstream of a diffuser of the gas turbine at least partially into a flow area outside of a combustion space of the combustion chamber to cool a combustion chamber wall that delimits the combustion space, and wherein it has at least one mounting edge at which at least one attachment site is provided for fixating the covering part at the combustion chamber wall by means of a separate attachment element, wherein at least one guiding element is provided at the covering part in the area of the mounting edge that guides the partial flow of the fluid flow to be guided in the direction of the flow areas over and above a part of the attachment element that protrudes from the mounting edge during operation of the gas turbine.
 2. The covering part according to claim 1, wherein the at least one guiding element extends at least beyond a section of the mounting edge.
 3. The covering part according to claim 2, wherein the guiding element has a recess through which an attachment element that engages at the mounting edge for fixing the covering part is accessible, and/or through which an attachment element can be guided to the mounting edge for the purpose of fixating the covering part.
 4. The covering part according to claim 1, wherein the at least one guiding element is formed at the covering part.
 5. The covering part according to claim 4, wherein the mounting edge is formed in one piece with the guiding element.
 6. The covering part according to claim 5, wherein the mounting edge is bent with respect to a section of the covering part that forms the guiding element, so that the section of the covering part that forms the guiding element is positioned opposite the mounting edge.
 7. The covering part according to claim 6, wherein the mounting edge is bent with respect to a section of the covering part that forms the guiding element by at least 160°.
 8. The covering part according to claim 1, wherein at least one additional guiding element is provided at the covering part, by which a gap present between the guiding element and the adjacent combustion chamber wall is bridged when the covering part is in a state where it is installed according to the intended use.
 9. The covering part according to claim 8, wherein the additional guiding element is welded onto the covering part.
 10. The covering part according to claim 1, wherein the covering part is provided for fixation at an inner as well as at an outer combustion chamber wall, which together delimit the combustion space.
 11. The covering part according to claim 10, wherein at least one guiding element is provided at the covering part in the area of respectively one of at least two mounting edges, via which the covering part is fixated, on the one hand, at the outer combustion chamber wall and, on the other hand, at the inner combustion chamber wall.
 12. A combustion chamber assembly group for a gas turbine, with an inner and an outer combustion chamber wall, which together delimit a combustion space of the combustion chamber and define two flow areas that are separated from each other by the combustion space, a combustion chamber head, which is arranged downstream of a diffuser of the gas turbine and via which a part of a fluid flow can reach the interior of the combustion space, and a covering part according to claim 1 that is fixated in the area of the combustion chamber head.
 13. The covering chamber assembly group according to claim 12, wherein the mounting edge extends at least in the area of the attachment site substantially perpendicular or in parallel to a turbine axis.
 14. The covering chamber assembly group according to claim 12, wherein the covering part can be connected to a combustion chamber wall and a separate combustion chamber head plate, at which a fuel nozzle for injecting fuel into the combustion space is supported, in the area of the mounting edge of the covering part via a single attachment element.
 15. A gas turbine engine with a covering part according to claim
 1. 